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Audacity Models Pantera 50 - Tiger 50 > Tiger clutch bell to bearing loose again
 
 
Rennster
Veteran
Location: Hawaii

Is there another solution than gluing? I used JB weld and it held for awhile but it gave out today.
11-10-2008 05:01 AM
 
 
The Dude II
Senior Heliman
Location: Martinsville, IN - USA

Never found a permanent solution...just re-JB-weld every 20-30 flights.

Tried Loctite 620 as well...it too would come loose.

Weld would fix it...but you'd have to use the correct machine...not to destroy the bearing.

Achiever
11-10-2008 04:27 PM
 
 
scoyle
Senior Heliman
Location: IL

It might help to rough up the surface of the bearing inner race so the JB Weld will have something to hold onto. You can take a dremel with a carving bit and put some grooves in it.

Scott

Spend... Build... Fly... Crash... Repeat...
11-10-2008 04:34 PM
 
 
Machinehead01
Senior Heliman
Location: USA

609 loctite

609 lotite will probably hold the longest. It's made to hold the cylinders in an engine(full size) and it bonds solid in gaps as much as .015. I will caution you as what the directions say that it takes EXTREME heat to remove it, as in possibly new clutch and bearing if either has to be replaced. I assembled a hildabrand style rearend with it for my 1/4 scale nascar and it's still bonded to this day(10 years ago).

Thomas

I didn't say it was your fault, I said I was going to blame you!
11-10-2008 05:29 PM
 
 
MartyH
Key Veteran
Location: Lawrenceburg, Indiana

This too is a common situation with the Tiger. Mine were tight enough on my two Tigers that I could get some green loctite in there. It held ok but the tails failed and the heli's were gone before I had to worry about it a second time.

Marty,
Raptors,Evos, Panteras and more
11-10-2008 06:13 PM
 
 
Evolusia
Heliman
Location: UK

Bearing loose again

Hi,for you guys who are having trouble with this bearing can I say that the only way I can see it coming loose is if you have:

1. A loose fitting bearing to start with.
2. A knackered bearing which locks up in use.
3. A heavy radial load on the bearing when the drive is fully engaged.

My reasoning is as follows. This bearing is only meant to rotate when starting the engine and idling, its main purpose being to support and help keep the drive line axially true, it does not rotate when the clutch is fully engaged. If the clutch bell has sufficient run-out and the fan hub/clutch also has run-out, then this bearing and associated parts will be flexed around 18k times a minute as the drive line runs out of truth. Eventually this process will enlarge the bearing housing causing the problem you complain of.

Can I ask how many Tiger and Pantera owners have got a clutch bell that wobbles as it turns, even more who has a clutch bell that has no visible run-out at all.
11-30-2008 02:37 AM
 
 
Mr.HillBilly
Senior Heliman
Location: Salesville, OH - USA

I figure the bearing that they are talking about is the one on the top of the pinion gear. That is the only one that I have ever had break loose.

Where do you get 609 loctite at? I have never seen that one.
11-30-2008 03:50 PM
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

The trick to making this a permanent repair is to clean the pinion and the inside of the bearing with Acetone, this will remove all residue, you need to scuff up the inside of the bearing with something, I saw JB use a special tile type cerated bit in a dremal to just put a few scratch marks in the bearing lining, this will give the JB weld something to impregnate and with the outter area of the pinion cleaned the JB weld will fill in the groves and make a permanent bond, I've been running the same bearings and pinons for hundreds of flights without the pinion comming loose.

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Outrage
Morgan Fuel Rep
11-30-2008 05:22 PM
HOMEPAGE  
 
 
billm
Key Veteran
Location: Liberty Lake, WA

Clyde,
DUDE Glad to see your alive!!! How is your son doing. Did he make the nats this year? Awsome pilot your boy is.
Folks. This man has the pinion fix. Trust me.
Durring the first run of Tigers we had this problem. It's an easy deal and I noticed on my panteras I have had no problems.
I have a bit of wobble when the clutch is installed "without" the motor installed. The shaft will firm things up. Run out is in the mud. If you dial in your clutch runout, all will be golden.

My name is Billm. Cough, and I'm a Heli Holic
12-01-2008 01:06 AM
 
 
Rennster
Veteran
Location: Hawaii

problem solved...sold it
12-01-2008 03:14 AM
 
 
Machinehead01
Senior Heliman
Location: USA

609 Loctite

You should be able to get the 609 at an automotive parts shop, just make sure that the one you select does machine work on engines. They will know what the stuff is, just ask them what they are using to bond the cylinder sleeves in with.

Thomas

I didn't say it was your fault, I said I was going to blame you!
12-01-2008 04:03 AM
 
 
Evolusia
Heliman
Location: UK

Clutch bell to bearing loose again

Whoops, looks like I got the wrong end of the stick here, sorry about that. However with regards to this topic proper, I would have thought that if the pinion journal was machined to the correct size i.e -0.0001 to -0.00025 inches under the bearing bore size, and there are no other extraneous forces at work due to mis-alignment, then the application of loctite bearing fit on first assembly should be all that is necessary for a solid fix. If it subsequently comes loose then there must be some other force(s) at work that are not meant to be there. Once this journal has worn I don`t think you will ever really effect a sound mechanical repair without actually replacing the pinion and probably the bearing as well.
12-02-2008 03:12 AM
 
 
brown1957
Heliman
Location: Newton,ks

Your bore my be egg shape. A press fit should be about .001-.002 under
Also try LOCTITE 380 Black Max Black Toughened Instant Adhesive .
It took 10tons to press a shaft bearing out of a cyclinder @ work.
So this stuf works....... After you try it don't ask how to get the bearing out...
12-03-2008 10:38 PM
 
 
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Audacity Models Pantera 50 - Tiger 50 > Tiger clutch bell to bearing loose again
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